initial commit

vendor/github.com/gtank/cryptopasta/sign_test.go

@@ -0,0 +1,107 @@
+// cryptopasta - basic cryptography examples
+//
+// Written in 2015 by George Tankersley <george.tankersley@gmail.com>
+//
+// To the extent possible under law, the author(s) have dedicated all copyright
+// and related and neighboring rights to this software to the public domain
+// worldwide. This software is distributed without any warranty.
+//
+// You should have received a copy of the CC0 Public Domain Dedication along
+// with this software. If not, see // <http://creativecommons.org/publicdomain/zero/1.0/>.
+
+package cryptopasta
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"encoding/hex"
+	"testing"
+)
+
+// https://groups.google.com/d/msg/sci.crypt/OolWgsgQD-8/jHciyWkaL0gJ
+var hmacTests = []struct {
+	key    string
+	data   string
+	digest string
+}{
+	{
+		key:    "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b",
+		data:   "4869205468657265", // "Hi There"
+		digest: "9f9126c3d9c3c330d760425ca8a217e31feae31bfe70196ff81642b868402eab",
+	},
+	{
+		key:    "4a656665",                                                 // "Jefe"
+		data:   "7768617420646f2079612077616e7420666f72206e6f7468696e673f", // "what do ya want for nothing?"
+		digest: "6df7b24630d5ccb2ee335407081a87188c221489768fa2020513b2d593359456",
+	},
+}
+
+func TestHMAC(t *testing.T) {
+	for idx, tt := range hmacTests {
+		keySlice, _ := hex.DecodeString(tt.key)
+		dataBytes, _ := hex.DecodeString(tt.data)
+		expectedDigest, _ := hex.DecodeString(tt.digest)
+
+		keyBytes := &[32]byte{}
+		copy(keyBytes[:], keySlice)
+
+		macDigest := GenerateHMAC(dataBytes, keyBytes)
+		if !bytes.Equal(macDigest, expectedDigest) {
+			t.Errorf("test %d generated unexpected mac", idx)
+		}
+	}
+}
+
+func TestSign(t *testing.T) {
+	message := []byte("Hello, world!")
+
+	key, err := NewSigningKey()
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	signature, err := Sign(message, key)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	if !Verify(message, signature, &key.PublicKey) {
+		t.Error("signature was not correct")
+		return
+	}
+
+	message[0] ^= 0xff
+	if Verify(message, signature, &key.PublicKey) {
+		t.Error("signature was good for altered message")
+	}
+}
+
+func TestSignWithP384(t *testing.T) {
+	message := []byte("Hello, world!")
+
+	key, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	signature, err := Sign(message, key)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	if !Verify(message, signature, &key.PublicKey) {
+		t.Error("signature was not correct")
+		return
+	}
+
+	message[0] ^= 0xff
+	if Verify(message, signature, &key.PublicKey) {
+		t.Error("signature was good for altered message")
+	}
+}